Forgotten measurements

#include <bits/stdc++.h>
using namespace std;
typedef unsigned long long ull;
typedef long long ll;
#define all(x) x.begin(), x.end()
#define rep(i,a,b) for(int i=a; i<=b; i++)

int main(){
    ios::sync_with_stdio(0);

    string s;
    s.reserve(1000000);
    cin >> s;

    ll ldu = 0, ldl = 0, udu = 0, udl = 0;
    ll ld = 0, ud = 0;
    for(char c : s){
        switch(c){
            case 'U':
                ud ++;
                break;
            case 'D':
                ud --;
                break;
            case 'L':
                ld --;
                break;
            case 'R':
                ld ++;
                break;
            default:
                break;
        }

        ldu = max(ldu, ld);
        ldl = min(ldl, ld);
        udu = max(udu, ud);
        udl = min(udl, ud);
    }

    ud = abs(udu - udl);
    ld = abs(ldu - ldl);

    cout << (ud + ld) << "\n";
}

Test 1

Verdict: WRONG ANSWER

Test 2

Verdict: ACCEPTED

Test 3

Verdict: WRONG ANSWER

Test 4

Verdict: WRONG ANSWER

Test 5

Verdict: WRONG ANSWER

Test 6

Verdict: WRONG ANSWER

Test 7

Verdict: WRONG ANSWER

Test 8

Verdict: WRONG ANSWER

Test 9

Verdict: WRONG ANSWER

Test 10

Verdict: WRONG ANSWER

Test 11

Verdict: WRONG ANSWER